68490889 has 2 divisors, whose sum is σ = 68490890. Its totient is φ = 68490888.

The previous prime is 68490871. The next prime is 68490899. The reversal of 68490889 is 98809486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52809289 + 15681600 = 7267^2 + 3960^2 .

It is a cyclic number.

It is not a de Polignac number, because 68490889 - 2⁵ = 68490857 is a prime.

It is not a weakly prime, because it can be changed into another prime (68490899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34245444 + 34245445.

It is an arithmetic number, because the mean of its divisors is an integer number (34245445).

Almost surely, 2^68490889 is an apocalyptic number.

It is an amenable number.

68490889 is a deficient number, since it is larger than the sum of its proper divisors (1).

68490889 is an equidigital number, since it uses as much as digits as its factorization.

68490889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 52.

The square root of 68490889 is about 8275.9222446806. The cubic root of 68490889 is about 409.1453324662.

The spelling of 68490889 in words is "sixty-eight million, four hundred ninety thousand, eight hundred eighty-nine".